. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 158 A renicolidae neuropodia are short, septal pouches are absent, and there are several pairs of oesophageal caeca. Of the caudate species, A. marina and A. assimilis present fewest modifications and stand near the bases of origin of the two series. Nearly related to A. marina is A. <jlacialis, their close affinity being indicated by the similarity of their neuropodia, chaetae, oesophageal glands, septal pouches, nephridia and statoliths; the gills and prostomium of A. fjlacialis also more nearl
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. 158 A renicolidae neuropodia are short, septal pouches are absent, and there are several pairs of oesophageal caeca. Of the caudate species, A. marina and A. assimilis present fewest modifications and stand near the bases of origin of the two series. Nearly related to A. marina is A. <jlacialis, their close affinity being indicated by the similarity of their neuropodia, chaetae, oesophageal glands, septal pouches, nephridia and statoliths; the gills and prostomium of A. fjlacialis also more nearly resemble those of A. marina than of any other species. The chief difference between these two species is that in A. glacialis the chaetiferous segments and gills are reduced in number. The two species A. loceni and A. cristata have apparently sprung from the same stem, for in both the neuropodia are long, the gills highly pinnate, the septal pouches large, and the statocysts closed and cristata ijusilla hranchialis. B raiichiomaldane each containing only a single large statolith. Further indication of their affinity is afforded by the similar form of their prostomia ; while, in the cliaracter of its chaetae, A. loveni presents a closer approach to A. cristata than to any other species. A. loveni exhibits considerable specialisation in its extraordinary septal pouches and its notopodial chaetae, while A. cristata has undergone modification in another direction, namely, reduction in the number of its chaetiferous segments and gills. The two species A. loveni and A. cristata are clearly more nearly related to each other than either is to A. marina. A. assimilis a,iid A. pusilla diverge from the rest of the species in several striking features (p. 157) and have developed along an independent line. A. assimilis has primitive statocysts, and its prostomium is little modified, being not much dissimilar to that of. Please note that these images are extracted from scanned page images
Size: 1775px × 1407px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
